| Records |
| Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Semenov, A. D.; Sergeev, A. V. |
| Title |
Mechanism of picosecond response of granular YBaCuO films to electromagnetic radiation |
Type |
Journal Article |
| Year |
1990 |
Publication  |
Solid State Communications |
Abbreviated Journal |
Solid State Communications |
| Volume |
76 |
Issue |
4 |
Pages |
493-497 |
| Keywords |
YBCO HTS detectors |
| Abstract |
The ultrafast mechanisms of radiation detection in granular YBaCuO films are studied in the wide wavelength range from millimeter to near infrared. With the rise of radiation frequency the Josephson detection at the grain boundary weak links is replaced by electron heating into the grains. This change occurs in the submillimeter wavelength range. Electron-phonon relaxation time τeph is determined by direct measurements and analyses quasistationary electron heating. Temperature dependence of τeph at T ≤ 40 K was found to be τeph ∼ T−1. The results show that detectors with the response time of few picoseconds at nitrogen temperature are attainable. |
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0038-1098 |
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1685 |
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| Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Potapov, V. D.; Sergeev, A. V. |
| Title |
Restriction of microwave enhancement of superconductivity in impure superconductors due to electron-electron interaction |
Type |
Journal Article |
| Year |
1990 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Communications |
| Volume |
75 |
Issue |
8 |
Pages |
639-641 |
| Keywords |
impure superconductors |
| Abstract |
Transition from microwave enhancement of supercurrent to superconductivity suppression is investigated in impure superconductors. It is demonstrated that the frequency range of the enhancement effect narrows with the decrease of the electron mean free path, l, and at l ⩽ 1 nm electron heating is observed in the whole frequency range. Dependences of frequency boundaries on l are explained by taking into account strong electron-electron interaction in impure metals. |
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0038-1098 |
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1687 |
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| Author |
Gol’tsman, G.N. |
| Title |
Overview of recent results for superconducting NbN terahertz and optical detectors and mixers |
Type |
Miscellaneous |
| Year |
2014 |
Publication |
SM2 – Seminar on Terahertz Photonics |
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Issue |
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Pages |
0562 |
| Keywords |
NbN SSPD, SNSPD, HEB |
| Abstract |
We present our recent achievements in the development of sensitive and ultrafast thin-film superconducting sensors: hot-electron bolometers (HEB), HEB-mixers for terahertz range and infrared single-photon counters. These sensors have already demonstrated a performance that makes them devices-of-choice for many terahertz and optical applications. |
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1746 |
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Shangina, E. L.; Smirnov, K. V.; Morozov, D. V.; Kovalyuk, V. V.; Goltsman, G. N.; Verevkin, A. A.; Toropov, A. I.; Mauskopf, P. |
| Title |
Concentration dependence of energy relaxation time in AlGaAs/GaAs heterojunctions: direct measurements |
Type |
Journal Article |
| Year |
2011 |
Publication |
Semicond. Sci. Technol. |
Abbreviated Journal |
Semicond. Sci. Technol. |
| Volume |
26 |
Issue |
2 |
Pages |
025013 |
| Keywords |
AlGaAs/GaAs heterojunctions |
| Abstract |
We present measurements of the energy relaxation time, τε, of electrons in a single heterojunction in a quasi-equilibrium state using microwave time-resolved spectroscopy at 4.2 K. We find the relaxation time has a power-law dependence on the carrier density of the two-dimensional electron gas, τε∝nγs with γ = 0.40 ± 0.02 for values of the carrier density, ns, from 1.6 × 1011 to 6.6 × 1011cm−2. The results are in good agreement with predictions taking into account the scattering of the carriers by both piezoelectric and deformation potential acoustic phonons. We compare these results with indirect measurements of the energy relaxation time from energy loss measurements involving Joule heating of the electron gas. |
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| ISSN |
0268-1242 |
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no |
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1215 |
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Shangina, E. L.; Smirnov, K. V.; Morozov, D. V.; Kovalyuk, V. V.; Gol’tsman, G. N.; Verevkin, A. A.; Toropov, A. I. |
| Title |
Frequency bandwidth and conversion loss of a semiconductor heterodyne receiver with phonon cooling of two-dimensional electrons |
Type |
Journal Article |
| Year |
2010 |
Publication |
Semicond. |
Abbreviated Journal |
Semicond. |
| Volume |
44 |
Issue |
11 |
Pages |
1427-1429 |
| Keywords |
2DEG, AlGaAs/GaAs heterostructures mixers |
| Abstract |
The temperature and concentration dependences of the frequency bandwidth of terahertz heterodyne AlGaAs/GaAs detectors based on hot electron phenomena with phonon cooling of two-dimensional electrons have been measured by submillimeter spectroscopy with a high time resolution. At a temperature of 4.2 K, the frequency bandwidth at a level of 3 dB (f 3 dB) is varied from 150 to 250 MHz with a change in the concentration n s according to the power law f 3dB ∝ n −0.5 s due to the dominant contribution of piezoelectric phonon scattering. The minimum conversion loss of the semiconductor heterodyne detector is obtained in structures with a high carrier mobility (μ > 3 × 105 cm2 V−1 s−1 at 4.2 K). |
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1063-7826 |
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| Notes |
Полоса и потери преобразования полупроводникового смесителя с фононным каналом охлаждения двумерных электронов |
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1216 |
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